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When an electric current flows into the page, what is the direction of the magnetic field?
Clockwise
Anti-clockwise
Cannot be determined
Parallel to the current
Clockwise
Quick Trick: Point your right thumb into the page (direction of current); your curling fingers naturally trace a clockwise circle, giving the magnetic field direction instantly.
Point your right thumb into the page (direction of current); your curling fingers naturally trace a clockwise circle, giving the magnetic field direction instantly.
Identify Current Direction and Rule
The current moves away from the observer into the page (represented by a cross symbol 'X'). To find the circular magnetic field direction around a straight conductor, use Maxwell's Right-Hand Thumb Rule.
Apply Right-Hand Thumb Rule
Point the thumb of your right hand into the page along the direction of current flow. Observe the direction in which your fingers curl around the thumb.
Determine Field Orientation
The fingers curl in a clockwise direction around the conductor. Thus, the magnetic field lines form concentric circles in a clockwise orientation.
B: Anti-clockwise field occurs when current flows out of the page towards you. C: The direction is definitively determined by the Right-Hand Thumb Rule. D: The magnetic field is perpendicular to the current, forming concentric loops, not parallel.
A is correct because pointing the right-hand thumb into the page causes the fingers to curl in a clockwise direction around the current path.
Remember the dot and cross convention: a Dot (.) means current coming OUT (anti-clockwise field), while a Cross (X) means current going IN (clockwise field).